Soft-feedback MMSE equalization for non-orthogonal frequency division multiplexing (n-OFDM) signal detection

2012 ◽  
Author(s):  
Norulhusna Ahmad ◽  
S. Kamilah Syed-Yusof ◽  
Norsheila Fisal ◽  
Khoirul Anwar ◽  
Tad Matsumoto
Keyword(s):  
Signal Detection ◽  
Orthogonal Frequency Division Multiplexing ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Ofdm Signal

scholarly journals A Novel Quadrature-Tracking Demodulator for LTE-A Applications

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Kang-Chun Peng ◽  
Chan-Hung Lee
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Phase Locked Loop ◽  
Cmos Technology ◽  
Experimental Results ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Ofdm System ◽  
Ofdm Signal ◽  
Quadrature Phase

This work develops an advanced quadrature-tracking demodulation technique for coherently demodulating the orthogonal frequency-division multiplexing (OFDM) signal of LTE-A systems. To overcome the fact that traditional coherent demodulators are extremely sensitive to the quadrature imbalance of a system, especially an OFDM system, the proposed architecture uses a novel quadrature phase-locked loop (QPLL) to track simultaneously the in phase (I-phase) and the quadrature phase (Q-phase) of the received signal. This advanced quadrature-tracking demodulator is realized using TSMC 0.18 μm CMOS technology and hybrid circuits. Experimental results indicate that the developed quadrature-tracking demodulator, which operates at 2.1~2.5 GHz, can effectively demodulate an 18 Mbps LTE-A signal, even with a 15 degree quadrature imbalance.

Performance Analysis of Long-Reach Coherent Detection OFDM-PON Downstream Transmission Using m-QAM-Mapped OFDM Signal

2017 ◽  
Vol 38 (4) ◽  
Author(s):  
Gaurav Pandey ◽  
Aditya Goel
Keyword(s):  
Performance Analysis ◽  
Orthogonal Frequency Division Multiplexing ◽  
Optical Network ◽  
Coherent Detection ◽  
Passive Optical Network ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Ofdm Signal

AbstractIn this paper, orthogonal frequency division multiplexing (OFDM)-passive optical network (PON) downstream transmission is demonstrated over different lengths of fiber at remote node (RN) for different

High Capacity and Power Efficient PON Combining ACO-OFDM and WDM Technologies

2014 ◽  
Vol 909 ◽  
pp. 260-264
Author(s):  
Kai Guo ◽  
Yun Jia Zhang ◽  
Dan Luo ◽  
Zhuo Liu
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
High Capacity ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Transmission Scheme ◽  
Power Efficient ◽  
Ofdm Signal

An upstream transmission scheme of asymmetric clipping optical orthogonal frequency division multiplexing (ACO-OFDM) based WDMA-PON is proposed. Performance of 10Gbit/s/ONU upstream ACO-OFDM signal is analyzed. The scheme is high capacity and power efficient.

scholarly journals Simple 2D chaotic remapping scheme for securing optical communication networks

2019 ◽  
Vol 25 (12) ◽  
pp. 85-95
Author(s):  
Hiba Abdel Wahab Jabori ◽  
Oday A.L.A Ridha
Keyword(s):  
Communication Networks ◽  
Physical Layer Security ◽  
Orthogonal Frequency Division Multiplexing ◽  
Chaotic Map ◽  
Matrix Multiplication ◽  
Average Power ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
System A ◽  
Ofdm Signal

In this work, a simple and new method is proposed to simultaneously improve the physical layer security and the transmission performance of the optical orthogonal frequency division multiplexing system, by combining orthogonal frequency division multiplexing technique with chaotic theory principles. In the system, a 2-D chaotic map is employed. The introduced system replaces complex operations such as matrix multiplication with simple operations such as multiplexing and inverting. The system performance in terms of bit error rate (BER) and peak to average ratio (PAPR) is enhanced. The system is simulated using Optisystem15 with a MATLAB2016 and for different constellations. The simulation results showed that the  BER of an unauthorized receiver reaches 0.5.  Furthermore, the peak-to-average-power-ratio (PAPR) of the transmitted OFDM signal can be decreased by about 0.8 dB at BER equal to 10^-4.

scholarly journals Orthogonality Measurent of OFDM Signal

2018 ◽  
Vol 9 (3) ◽  
pp. 595 ◽  
Author(s):  
Mahendra Sharma ◽  
Santhosh Kumar Singh
Keyword(s):  
Bit Error Rate ◽  
Orthogonal Frequency Division Multiplexing ◽  
Data Stream ◽  
Signal Strength ◽  
Destination Node ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
High Data ◽  
Transmission Technique ◽  
Ofdm Signal

<p>In recent days, Orthogonal Frequency Division Multiplexing is the technique to transmit and receive the signal without any overlapping of the signal. OFDM is also a multiplexing technique as well as modulation technique. It is a multi-carrier transmission technique in which single high data stream is divided into a number of lower rate streams that are transmitted simultaneous over some narrow sub channel. In general, OFDM avoids Inter-Symbol Interference (ISI), Inter-Carrier Interference (ICI) and fault transmissions between source and destination node. To measure the performance of the system by using the parameters like Bit Error rate (BER), Spectrum analysis and signal strength detection. Based on the parameters the best system can be identified.</p>

Investigations of wavelength division multiplexing-orthogonal frequency division multiplexing (WDM-OFDM) system with 50 Gb/s optical access

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Gagandeep Kumar ◽  
Kulwinder Singh
Keyword(s):  
Optical Networks ◽  
Wavelength Division Multiplexing ◽  
Laser Power ◽  
Orthogonal Frequency Division Multiplexing ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Wavelength Division ◽  
Ofdm Signal ◽  
Power Mapping ◽  
Ofdm Signals

Abstract In the present work, orthogonal frequency division multiplexing (OFDM) is combined with wavelength division multiplexing-passive optical networks (WDMPONs) to obtain the combined benefits of both technologies for overall system improvement. performance of five OFDM signals using WDM is analyzed. An optical system is designed using the OFDM signal, and its performance is analyzed using various matrices like bit error rate (BER) and Q-factor under the effect of varying laser power. Mapping of OFDM signals is done using 16-QAM modulation. The system shows an enhancement in the performance by increasing the laser power but up to some limit, and efficient results are obtained in the 70–130 mW laser power range.

scholarly journals OFDM Signal Research with Varied Subcarriers Number

2016 ◽  
Vol 17 (3) ◽  
pp. 192-201 ◽  
Author(s):  
Leonid Uryvsky ◽  
Serhii Osypchuk
Keyword(s):  
Simulation Modeling ◽  
Orthogonal Frequency Division Multiplexing ◽  
Gain Factor ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Energy Characteristics ◽  
Signal Energy ◽  
Ofdm Signal ◽  
Signal Simulation ◽  
Information Reliability

AbstractThe orthogonal frequency division multiplexing (OFDM) aggregate signal energy characteristics are studied based on the OFDM signal simulation model. The information reliability of OFDM signal is explored for different sets of OFDM subcarrier numbers and varied multiposition keying types (MPK) on OFDM subcarriers. The conditions for optimal gain factor for OFDM signal are described analytically based on the simulation modeling results. The effect and value from using an optimal gain factor for OFDM signal is shown in this paper.

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